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The field of contenders vying to replace California Sen. Barbara Boxer continued to come into focus Monday, as Lieutenant Gov. Gavin Newsom ruled out a run for the retiring Democrat’s Senate seat.

Newsom, who previously served as the mayor of San Francisco, wrote in a Facebook post announcing his decision that “it’s always better to be candid than coy.”

“While I am humbled by the widespread encouragement of so many and hold in the highest esteem those who serve us in federal office, I know that my head and my heart, my young family's future, and our unfinished work all remain firmly in the State of California --- not Washington D.C.,” he said.

Newsom’s decision comes after former Los Angeles mayor Antonio Villaraigosa said he is “seriously” considering a Senate run, while the current mayor – Eric Garcetti – said he would not pursue one.

“I was honored to serve as Speaker of the CA Assembly and as Mayor of Los Angeles and it would be an honor to serve Californians again in the future,” Villaraigosa wrote, also in a Facebook post. “The urgency of the needs of the people of this great state have convinced me to seriously consider looking at running for California's open Senate seat.”

Also said to be possible Democratic contenders for the seat are California Attorney General Kamala Harris and billionaire environmental activist Tom Steyer.

- Carrie Dann